Creep Rupture Strength Data for A335 P22 1

[ak1965]

Where I can refer Creep Rupture Strength data or curves for A335 P22 Material?

 

[gr2vessels]

I found this on the internet:

http://www.sciencedirect.com/scienc...serid=10&md5=9d58437ebe0a755f1aaa786269088a0e

Check this and many more on the internet.

Cheers,
gr2vessels

 

[metengr]

You can try EPRI. They have been releasing some of their past publications on the public domain.

http://my.epri.com/portal/server.pt?

 

[ak1965]

thanks metengr

The link took me to an articel meant for sale.

I will try EPRI also.

However let me be specific. we have a pipe of A335 P22 , (105 kg/cm/62 press & 500 deg^c temp.) but accidentaly was subjected to a temperature more than 600 deg. c for 4 hrs.

Visual inspection revealed a creep in the pipe. the diameter has increased by 20%. can we use this pipe back into service after hydro test?

 

[metengr]

ak1965;
Apparently your original post regarding the failure was inadvertently deleted. Anyway, here is what I would suggest if the OD has increased by more than 5% after careful cleaning and checked with calipers or a pipe tape; I would not recommend it be re-used.

In my past life when we monitored both hot reheat and main stem piping, we performed in-situ surface replication and dimensional checks for creep swell. Normally, 5-7% creep swell is a good indicator that you are reaching end of creep rupture life. Remember, this is seamless material just like boiler tubes, and when you measure OD changes of this magnitude, replacement should be scheduled. If necessary, you could possibly push this limit to 8% with comprehensive surface replicas, as I mentioned in your OP.

 

[ak1965]

metengr

I too was surprised to see that the original mail has
become extinct suddenly. i searched but failed.

Any ways I appreciate your experience and we are also thinking on the same lines and arranging for in-situ replica followed by metallogrpahical examination of ruptured piece.

I shall get back to you with more inputs in due course of time.

 

[davefitz]

For the P22 fatigue data, see Brinkman et al:"Elevated temperature fatigue behavior of 2 1/4Cr 1 Mo steel", J Press vess tech, trans ASME Nov 1975 pp252-257. This formed the basis of the fatigue curves in the ASME code case N-47.

 

[ijzer]

See API 530 for required curves

 

[engrdon]

ASME Section III, Division 1, Subsection NH, Class 1 Components in Elevated Temperature Service, Table I-14.6D shows the expected minimum stress-to-rupture values for 2.25Cr-1Mo material. The values are given in customary units as well as SI units.

Hope this helps.

 

[MJCronin]

You say that "The diameter has increased by 20%"

This is evidence of extreme overheating damage.

I do not think you have many choices at this point in time.

Stand back...

 

[ak1965]

Mjcronin

We have replaced the whole P22 piping with new one and shall be hydortesting it soon.

Thanks for all guidance.